OEL-1246: Whitelabel oe_list_pages testing WIP.

...ges/tests/modules/oe_whitelabel_list_pages_test/README.md

...ges_test/config/install/facets.facet.oe_sc_news_title.yml

...cets.facet_source.list_facet_source__node__oe_sc_news.yml

...pages_test/config/install/search_api.index.test_index.yml

...list_pages_test/config/install/search_api.server.test.yml

...el_list_pages_test/oe_whitelabel_list_pages_test.info.yml

...ist_pages_test/oe_whitelabel_list_pages_test.services.yml

...st/src/EventSubscriber/ListPageAllowedTypesSubscriber.php

...telabel_list_pages/tests/src/Functional/ListPagesTest.php